Vapor separator



w. c.. QLIVERl VAPOR sEPARAToR July 3, 1945.

Filed March '7, 1944 Patented July3, 1945 Wilburl C. Oliver, Los George M. Holley ics gele's, Calif., a'slsignor to.

and Earl Holley Application Marchy 7, 1944, serial No. 525,395

general use during the last four years. ever, even with the pressure .type carburetor is 'of considerable importance so that this' invention is not limitedk to any particular type of carburetor.

The drawing shows diagrammatically the elements of my invention.

Fuel enters at ID and flows past the valve II controlled by a lever I2 A vapor separating chamber I chamber I 6. A fuel passage I9 obtains its fuel from chamber I6 through port I8. A iloat 2D is guided on a hollow pin 2I which, when the float is in the I9 so that more fuel iiows down the passage 35. whereby the throttles and 21 open and the needle 34 opens admitting fuel are not a part of this invention, being a part of a 'I is a part of which is provided isa 2 Claims. (01. zei-72)',

well-known airplane carburetor ofthe low vpressure type' (M. E. Chandler, Reg. No. 22,254), whichhas come into general use during the last seven years. v v

A passage 38 communicates with the back side of the throttle 25 and is thereforevsubjeeted to the suction of the venturi throughthe opening 26. Passage 36 is controlled by a valve 31 mounted on a diaphragm the left-hand side of an air chamber 39. This air chamber 39 communicates through passages 4I and 23 with the `'Ihe'passage 23, however, has a restricted communication with the carburetor inlet 'air pressure through restriction 42 and .thereforewi'll not materially diminish the suction existing in' passage 23 or chamber 39 if said suction is insuficient to close valve 3l against the tension of spring 4I). If said suction is suicient to close not vapor is being removed through ports 22.

`This constant differential pressure is governed by the tension of spring 4l'I.A

' Operation When vapor accumulates in chamber I6, andl therefore chamber I l, the vapor displaces fuel and 22 by means of the suction created by the airflow past the throttles 25 and 21 via ports 26, chamber 24,l passages 36 and 23.

Valve 27 remains op'en provided the differential pressure across the diaphragm 38 is insufficient air owing through restriction 42, passages 23 and 4I into chamber 39 will reduce ential pressure across valve 31 to assume a balanced, or lapl position .which will therefore vautomatically regulate a constant pressure diierential across diaphragm 38. The diaphragm forms f carburetor inlet air pressure.

the durer-r diaphragm 38 and cause 38 and hence ports 22. This constant pressure diierential is governed by the tension of spring 40 at the balanced position of valve 31. Valve 31 will naturally have a greater open'ng when vapor is being removed through ports 22, but the differential will remain the same.

Restriction 42 need only be large enough to accommodate the leakage of valve 31 in a closed position in order to break the suction which would be created in passage 23 if the ports 22 were closed and no restricted line 42 provided.

What I claim is:

l. A vapor separator for use in combination with an airplane carburetor having a throttle controlling the flow of air therethrough, comprising a vapor separating chamber, a floatk therein, a vapor outlet therefrom constructed and arranged so as to When the fuel level in said chamber falls below a predetermined level', a rst passage connectbe uncovered by said iioat ing said outlet to the air entrance to said carburetor a restriction in said passage, a second passage connecting said outlet to the engine side of said throttle, a valve in said second passage, a moving Wall subjected on one side to the pressure in the second passage and on the other to the pressure in said vapor separating chamber and to the force exerted by a spring, said valve being operatively connected to said moving wall whereby the vdepression applied -to 'the vapor outlet is prevented from becoming excessive.

2. A device as set forth in claim 1 in which the carburetor fuel supply is supplied to a pressure reducing chamber formed by a second moving. wall .which regulates the level of the fuel in said vapor separating chamber and in which this pressure reducing chamber is in free communication with the vapor separating chamber.

mLBUR c. OLIVER. 

